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Journal of Central South University of Technology

, Volume 12, Issue 6, pp 635–640 | Cite as

Microscopic phase-field simulation for nucleation incubation time of Ni75AlxV25−x alloy

  • Li Yong-sheng Email author
  • Chen Zheng 
  • Lu Yan-li 
  • Wang Yong-xin 
  • Zhang Jian-jun 
Article

Abstract

With the microscopic phase-field dynamic model, the effects of temperature and concentration on the nucleation incubation time of Ni75AlxV25−x alloy were studied and the relation between the incubation time and precipitation mechanism was investigated by using the atomic occupation probability picture and average order parameter curve. The simulation results demonstrate that there exists the incubation time for different precipitation mechanisms, such as non-classical nucleation, the mixed style of non-classical nucleation and spinodal decomposition, and spinodal ordering; and the incubation time shortens in turn for the three kinds of mechanisms. With the increase of Al content of Ni75AlxV25−x alloy, the incubation time of L12 phases shortens continuously and that of D022 phases is prolonged. The effects of temperature on the incubation time of L12 and D022 phases are accordant, i.e. the incubation time is greatly prolonged with the temperature rising.

Key words

microscopic phase-field nucleation incubation time order parameter simulation 

CLC number

TG111.5 

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Copyright information

© Central South University 2005

Authors and Affiliations

  • Li Yong-sheng 
    • 1
    Email author
  • Chen Zheng 
    • 1
    • 2
  • Lu Yan-li 
    • 1
  • Wang Yong-xin 
    • 1
  • Zhang Jian-jun 
    • 1
  1. 1.School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’anChina
  2. 2.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anChina

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